ON THE POSSIBLE EXPERIMENTS ON COHERENT PRODUCTION OF RELATIVISTIC POSITRONIUM IN A CRYSTAL

Generation of relativistic singlet positronium (Ps) atoms by high-ener gy photons and electrons in amorphous and aligned crystal targets, as well as their break-up due to interaction with target atoms, is consid ered. The detailed numerical calculations show that due to coherence e ffect in a crystal target, the significant enhancement of positronium yield, at certain positronium energies and emission angles, can be ach ieved. The possible experiments with tagged photon beam, with bremsstr ahlung (BS) photon beam and electron beam are proposed for planned REF ER facility at Hiroshima University. (C) 1998 Elsevier Science B.V. Al l rights reserved.